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Summary:
Now that GPU video decoders are available in doc CI, we run the tutorials with GPU decoders.

Pull Request resolved: https://github.com/pytorch/audio/pull/3478

Differential Revision: D47519672

Pulled By: mthrok

fbshipit-source-id: 2f95243100e9c75e17c2b4d306da164f0e31f8f2